X0202 4 2005-09-28 0 0000877931 ARTISOFT INC ASFT 0001044321 MARXE AUSTIN W & GREENHOUSE DAVID M 153 E 53RD ST 55TH FL NEW YORK NY 10022 0 0 1 0 Common Stock 2005-09-28 4 P 0 1537100 1.1386 A 5493983 I By Limited Partnerships Warrants 0.01 2005-09-28 4 J 0 94359 0.01 A 2005-09-28 2015-09-28 Common Stock 94359 292121 I By Limited Partnerships This is a joint filing by Austin W. Marxe (Marxe) and David M. Greenhouse (Greenhouse). They share voting and investment control over all securities owned by Special Situations Cayman Fund, L.P. (Cayman), Special Situations Private Equity Fund, LP (PE), Special Situations Technology Fund, L.P. (Tech) and Special Situations Technology II, L.P. (Tech II), respectively. 2,011,310 shares of CS, 433,206 Wts to purchase 116,537 CS are owned by Cayman, 1,963,649 shares of CS, 431,930 Wts to purchase 115,261 CS are owned by PE, 188,765 shares of CS, 37,206 Wts to purchase 9,931 CS are owned by Tech, and 1,038,138 shares of CS, 189,785 Wts to purchase 50,392 CS are owned by Tech II. The interest of Marxe and Greenhouse in the shares of Common Stock owned by Cayman, PE, Tech, and Tech II is limited to the extent of his pecuniary interest. Received Anti-Dilution Shares. Austin W. Marxe 2005-09-30 David M. Greenhouse 2005-09-30